Hi Shaun,
This design of hull forces the craft higher and higher the faster it goes. When it is high on the plane and almost hanging on the last few inches of
propshaft it can fall off the plane either way, usually to the right (Starboard) side because of
engine torque. The full size boats were fitted with 2 or 3
engines to help counteract this.
The British Powerboat Company, who originally designed the hull that Vospers copied back in the 1930s/40s also noticed this which led to double skinning the hull with 1 inch thick
mahogany for extra strength against pounding and falling on the waves. Lowering the drive angle of the propellor shafts and adding more
weight from the C of G back to near the
stern.
We
build this 3 screwed designed hull with one mainshaft usually so do not have the benefit of shaft
rotation to stabilise the boat at speed.
It was in the 1960's that Fairey
engineers had the same problems (Swordsman,Huntsman etc) They came up with large transom mounted powered Trim Tabs. Their boats had similar problems and only one shaft in the main.
I suggest you try fitting 2 x 2 inch wide by 1 inch deep trim tabs at the very bottom of your transom midway between the keel and the
chine as well as move your
battery packs forward a bit initially. Try some fast tests with this, you only need 2 to 4 degrees of down on the tabs initially. Add removeable
weights near the CG as needed, a bit at a time but don't stop the bow lifting up onto the plane.
Have fun, best of luck.
Ron Rees
huntsman
stern
prop
hull
fireboat
vosper
engine
battery pack
high speed
build
weight
chine
rc plane
power boat
fairey huntsman
mahogany
keel
rotation
battery
bow
fire boat
rc boat
propshaft
prop shaft
rc craft
engine mount